mirror of
https://github.com/dashpay/dash.git
synced 2024-12-29 05:49:11 +01:00
530 lines
16 KiB
C++
530 lines
16 KiB
C++
// Copyright (c) 2012 Pieter Wuille
|
|
// Copyright (c) 2012-2015 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#include "addrman.h"
|
|
|
|
#include "hash.h"
|
|
#include "serialize.h"
|
|
#include "streams.h"
|
|
|
|
int CAddrInfo::GetTriedBucket(const uint256& nKey) const
|
|
{
|
|
uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetKey()).GetHash().GetCheapHash();
|
|
uint64_t hash2 = (CHashWriter(SER_GETHASH, 0) << nKey << GetGroup() << (hash1 % ADDRMAN_TRIED_BUCKETS_PER_GROUP)).GetHash().GetCheapHash();
|
|
return hash2 % ADDRMAN_TRIED_BUCKET_COUNT;
|
|
}
|
|
|
|
int CAddrInfo::GetNewBucket(const uint256& nKey, const CNetAddr& src) const
|
|
{
|
|
std::vector<unsigned char> vchSourceGroupKey = src.GetGroup();
|
|
uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetGroup() << vchSourceGroupKey).GetHash().GetCheapHash();
|
|
uint64_t hash2 = (CHashWriter(SER_GETHASH, 0) << nKey << vchSourceGroupKey << (hash1 % ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP)).GetHash().GetCheapHash();
|
|
return hash2 % ADDRMAN_NEW_BUCKET_COUNT;
|
|
}
|
|
|
|
int CAddrInfo::GetBucketPosition(const uint256 &nKey, bool fNew, int nBucket) const
|
|
{
|
|
uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << (fNew ? 'N' : 'K') << nBucket << GetKey()).GetHash().GetCheapHash();
|
|
return hash1 % ADDRMAN_BUCKET_SIZE;
|
|
}
|
|
|
|
bool CAddrInfo::IsTerrible(int64_t nNow) const
|
|
{
|
|
if (nLastTry && nLastTry >= nNow - 60) // never remove things tried in the last minute
|
|
return false;
|
|
|
|
if (nTime > nNow + 10 * 60) // came in a flying DeLorean
|
|
return true;
|
|
|
|
if (nTime == 0 || nNow - nTime > ADDRMAN_HORIZON_DAYS * 24 * 60 * 60) // not seen in recent history
|
|
return true;
|
|
|
|
if (nLastSuccess == 0 && nAttempts >= ADDRMAN_RETRIES) // tried N times and never a success
|
|
return true;
|
|
|
|
if (nNow - nLastSuccess > ADDRMAN_MIN_FAIL_DAYS * 24 * 60 * 60 && nAttempts >= ADDRMAN_MAX_FAILURES) // N successive failures in the last week
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
double CAddrInfo::GetChance(int64_t nNow) const
|
|
{
|
|
double fChance = 1.0;
|
|
|
|
int64_t nSinceLastSeen = nNow - nTime;
|
|
int64_t nSinceLastTry = nNow - nLastTry;
|
|
|
|
if (nSinceLastSeen < 0)
|
|
nSinceLastSeen = 0;
|
|
if (nSinceLastTry < 0)
|
|
nSinceLastTry = 0;
|
|
|
|
// deprioritize very recent attempts away
|
|
if (nSinceLastTry < 60 * 10)
|
|
fChance *= 0.01;
|
|
|
|
// deprioritize 66% after each failed attempt, but at most 1/28th to avoid the search taking forever or overly penalizing outages.
|
|
fChance *= pow(0.66, std::min(nAttempts, 8));
|
|
|
|
return fChance;
|
|
}
|
|
|
|
CAddrInfo* CAddrMan::Find(const CNetAddr& addr, int* pnId)
|
|
{
|
|
std::map<CNetAddr, int>::iterator it = mapAddr.find(addr);
|
|
if (it == mapAddr.end())
|
|
return NULL;
|
|
if (pnId)
|
|
*pnId = (*it).second;
|
|
std::map<int, CAddrInfo>::iterator it2 = mapInfo.find((*it).second);
|
|
if (it2 != mapInfo.end())
|
|
return &(*it2).second;
|
|
return NULL;
|
|
}
|
|
|
|
CAddrInfo* CAddrMan::Create(const CAddress& addr, const CNetAddr& addrSource, int* pnId)
|
|
{
|
|
int nId = nIdCount++;
|
|
mapInfo[nId] = CAddrInfo(addr, addrSource);
|
|
mapAddr[addr] = nId;
|
|
mapInfo[nId].nRandomPos = vRandom.size();
|
|
vRandom.push_back(nId);
|
|
if (pnId)
|
|
*pnId = nId;
|
|
return &mapInfo[nId];
|
|
}
|
|
|
|
void CAddrMan::SwapRandom(unsigned int nRndPos1, unsigned int nRndPos2)
|
|
{
|
|
if (nRndPos1 == nRndPos2)
|
|
return;
|
|
|
|
assert(nRndPos1 < vRandom.size() && nRndPos2 < vRandom.size());
|
|
|
|
int nId1 = vRandom[nRndPos1];
|
|
int nId2 = vRandom[nRndPos2];
|
|
|
|
assert(mapInfo.count(nId1) == 1);
|
|
assert(mapInfo.count(nId2) == 1);
|
|
|
|
mapInfo[nId1].nRandomPos = nRndPos2;
|
|
mapInfo[nId2].nRandomPos = nRndPos1;
|
|
|
|
vRandom[nRndPos1] = nId2;
|
|
vRandom[nRndPos2] = nId1;
|
|
}
|
|
|
|
void CAddrMan::Delete(int nId)
|
|
{
|
|
assert(mapInfo.count(nId) != 0);
|
|
CAddrInfo& info = mapInfo[nId];
|
|
assert(!info.fInTried);
|
|
assert(info.nRefCount == 0);
|
|
|
|
SwapRandom(info.nRandomPos, vRandom.size() - 1);
|
|
vRandom.pop_back();
|
|
mapAddr.erase(info);
|
|
mapInfo.erase(nId);
|
|
nNew--;
|
|
}
|
|
|
|
void CAddrMan::ClearNew(int nUBucket, int nUBucketPos)
|
|
{
|
|
// if there is an entry in the specified bucket, delete it.
|
|
if (vvNew[nUBucket][nUBucketPos] != -1) {
|
|
int nIdDelete = vvNew[nUBucket][nUBucketPos];
|
|
CAddrInfo& infoDelete = mapInfo[nIdDelete];
|
|
assert(infoDelete.nRefCount > 0);
|
|
infoDelete.nRefCount--;
|
|
vvNew[nUBucket][nUBucketPos] = -1;
|
|
if (infoDelete.nRefCount == 0) {
|
|
Delete(nIdDelete);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CAddrMan::MakeTried(CAddrInfo& info, int nId)
|
|
{
|
|
// remove the entry from all new buckets
|
|
for (int bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
|
|
int pos = info.GetBucketPosition(nKey, true, bucket);
|
|
if (vvNew[bucket][pos] == nId) {
|
|
vvNew[bucket][pos] = -1;
|
|
info.nRefCount--;
|
|
}
|
|
}
|
|
nNew--;
|
|
|
|
assert(info.nRefCount == 0);
|
|
|
|
// which tried bucket to move the entry to
|
|
int nKBucket = info.GetTriedBucket(nKey);
|
|
int nKBucketPos = info.GetBucketPosition(nKey, false, nKBucket);
|
|
|
|
// first make space to add it (the existing tried entry there is moved to new, deleting whatever is there).
|
|
if (vvTried[nKBucket][nKBucketPos] != -1) {
|
|
// find an item to evict
|
|
int nIdEvict = vvTried[nKBucket][nKBucketPos];
|
|
assert(mapInfo.count(nIdEvict) == 1);
|
|
CAddrInfo& infoOld = mapInfo[nIdEvict];
|
|
|
|
// Remove the to-be-evicted item from the tried set.
|
|
infoOld.fInTried = false;
|
|
vvTried[nKBucket][nKBucketPos] = -1;
|
|
nTried--;
|
|
|
|
// find which new bucket it belongs to
|
|
int nUBucket = infoOld.GetNewBucket(nKey);
|
|
int nUBucketPos = infoOld.GetBucketPosition(nKey, true, nUBucket);
|
|
ClearNew(nUBucket, nUBucketPos);
|
|
assert(vvNew[nUBucket][nUBucketPos] == -1);
|
|
|
|
// Enter it into the new set again.
|
|
infoOld.nRefCount = 1;
|
|
vvNew[nUBucket][nUBucketPos] = nIdEvict;
|
|
nNew++;
|
|
}
|
|
assert(vvTried[nKBucket][nKBucketPos] == -1);
|
|
|
|
vvTried[nKBucket][nKBucketPos] = nId;
|
|
nTried++;
|
|
info.fInTried = true;
|
|
}
|
|
|
|
void CAddrMan::Good_(const CService& addr, int64_t nTime)
|
|
{
|
|
int nId;
|
|
|
|
nLastGood = nTime;
|
|
|
|
CAddrInfo* pinfo = Find(addr, &nId);
|
|
|
|
// if not found, bail out
|
|
if (!pinfo)
|
|
return;
|
|
|
|
CAddrInfo& info = *pinfo;
|
|
|
|
// check whether we are talking about the exact same CService (including same port)
|
|
if (info != addr)
|
|
return;
|
|
|
|
// update info
|
|
info.nLastSuccess = nTime;
|
|
info.nLastTry = nTime;
|
|
info.nAttempts = 0;
|
|
// nTime is not updated here, to avoid leaking information about
|
|
// currently-connected peers.
|
|
|
|
// if it is already in the tried set, don't do anything else
|
|
if (info.fInTried)
|
|
return;
|
|
|
|
// find a bucket it is in now
|
|
int nRnd = RandomInt(ADDRMAN_NEW_BUCKET_COUNT);
|
|
int nUBucket = -1;
|
|
for (unsigned int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
|
|
int nB = (n + nRnd) % ADDRMAN_NEW_BUCKET_COUNT;
|
|
int nBpos = info.GetBucketPosition(nKey, true, nB);
|
|
if (vvNew[nB][nBpos] == nId) {
|
|
nUBucket = nB;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// if no bucket is found, something bad happened;
|
|
// TODO: maybe re-add the node, but for now, just bail out
|
|
if (nUBucket == -1)
|
|
return;
|
|
|
|
LogPrint("addrman", "Moving %s to tried\n", addr.ToString());
|
|
|
|
// move nId to the tried tables
|
|
MakeTried(info, nId);
|
|
}
|
|
|
|
bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimePenalty)
|
|
{
|
|
if (!addr.IsRoutable())
|
|
return false;
|
|
|
|
bool fNew = false;
|
|
int nId;
|
|
CAddrInfo* pinfo = Find(addr, &nId);
|
|
|
|
// Do not set a penality for a source's self-announcement
|
|
if (addr == source) {
|
|
nTimePenalty = 0;
|
|
}
|
|
|
|
if (pinfo) {
|
|
// periodically update nTime
|
|
bool fCurrentlyOnline = (GetAdjustedTime() - addr.nTime < 24 * 60 * 60);
|
|
int64_t nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60);
|
|
if (addr.nTime && (!pinfo->nTime || pinfo->nTime < addr.nTime - nUpdateInterval - nTimePenalty))
|
|
pinfo->nTime = std::max((int64_t)0, addr.nTime - nTimePenalty);
|
|
|
|
// add services
|
|
pinfo->nServices = ServiceFlags(pinfo->nServices | addr.nServices);
|
|
|
|
// do not update if no new information is present
|
|
if (!addr.nTime || (pinfo->nTime && addr.nTime <= pinfo->nTime))
|
|
return false;
|
|
|
|
// do not update if the entry was already in the "tried" table
|
|
if (pinfo->fInTried)
|
|
return false;
|
|
|
|
// do not update if the max reference count is reached
|
|
if (pinfo->nRefCount == ADDRMAN_NEW_BUCKETS_PER_ADDRESS)
|
|
return false;
|
|
|
|
// stochastic test: previous nRefCount == N: 2^N times harder to increase it
|
|
int nFactor = 1;
|
|
for (int n = 0; n < pinfo->nRefCount; n++)
|
|
nFactor *= 2;
|
|
if (nFactor > 1 && (RandomInt(nFactor) != 0))
|
|
return false;
|
|
} else {
|
|
pinfo = Create(addr, source, &nId);
|
|
pinfo->nTime = std::max((int64_t)0, (int64_t)pinfo->nTime - nTimePenalty);
|
|
nNew++;
|
|
fNew = true;
|
|
}
|
|
|
|
int nUBucket = pinfo->GetNewBucket(nKey, source);
|
|
int nUBucketPos = pinfo->GetBucketPosition(nKey, true, nUBucket);
|
|
if (vvNew[nUBucket][nUBucketPos] != nId) {
|
|
bool fInsert = vvNew[nUBucket][nUBucketPos] == -1;
|
|
if (!fInsert) {
|
|
CAddrInfo& infoExisting = mapInfo[vvNew[nUBucket][nUBucketPos]];
|
|
if (infoExisting.IsTerrible() || (infoExisting.nRefCount > 1 && pinfo->nRefCount == 0)) {
|
|
// Overwrite the existing new table entry.
|
|
fInsert = true;
|
|
}
|
|
}
|
|
if (fInsert) {
|
|
ClearNew(nUBucket, nUBucketPos);
|
|
pinfo->nRefCount++;
|
|
vvNew[nUBucket][nUBucketPos] = nId;
|
|
} else {
|
|
if (pinfo->nRefCount == 0) {
|
|
Delete(nId);
|
|
}
|
|
}
|
|
}
|
|
return fNew;
|
|
}
|
|
|
|
void CAddrMan::Attempt_(const CService& addr, bool fCountFailure, int64_t nTime)
|
|
{
|
|
CAddrInfo* pinfo = Find(addr);
|
|
|
|
// if not found, bail out
|
|
if (!pinfo)
|
|
return;
|
|
|
|
CAddrInfo& info = *pinfo;
|
|
|
|
// check whether we are talking about the exact same CService (including same port)
|
|
if (info != addr)
|
|
return;
|
|
|
|
// update info
|
|
info.nLastTry = nTime;
|
|
if (fCountFailure && info.nLastCountAttempt < nLastGood) {
|
|
info.nLastCountAttempt = nTime;
|
|
info.nAttempts++;
|
|
}
|
|
}
|
|
|
|
CAddrInfo CAddrMan::Select_(bool newOnly)
|
|
{
|
|
if (size() == 0)
|
|
return CAddrInfo();
|
|
|
|
if (newOnly && nNew == 0)
|
|
return CAddrInfo();
|
|
|
|
// Use a 50% chance for choosing between tried and new table entries.
|
|
if (!newOnly &&
|
|
(nTried > 0 && (nNew == 0 || RandomInt(2) == 0))) {
|
|
// use a tried node
|
|
double fChanceFactor = 1.0;
|
|
while (1) {
|
|
int nKBucket = RandomInt(ADDRMAN_TRIED_BUCKET_COUNT);
|
|
int nKBucketPos = RandomInt(ADDRMAN_BUCKET_SIZE);
|
|
while (vvTried[nKBucket][nKBucketPos] == -1) {
|
|
nKBucket = (nKBucket + insecure_rand.rand32()) % ADDRMAN_TRIED_BUCKET_COUNT;
|
|
nKBucketPos = (nKBucketPos + insecure_rand.rand32()) % ADDRMAN_BUCKET_SIZE;
|
|
}
|
|
int nId = vvTried[nKBucket][nKBucketPos];
|
|
assert(mapInfo.count(nId) == 1);
|
|
CAddrInfo& info = mapInfo[nId];
|
|
if (RandomInt(1 << 30) < fChanceFactor * info.GetChance() * (1 << 30))
|
|
return info;
|
|
fChanceFactor *= 1.2;
|
|
}
|
|
} else {
|
|
// use a new node
|
|
double fChanceFactor = 1.0;
|
|
while (1) {
|
|
int nUBucket = RandomInt(ADDRMAN_NEW_BUCKET_COUNT);
|
|
int nUBucketPos = RandomInt(ADDRMAN_BUCKET_SIZE);
|
|
while (vvNew[nUBucket][nUBucketPos] == -1) {
|
|
nUBucket = (nUBucket + insecure_rand.rand32()) % ADDRMAN_NEW_BUCKET_COUNT;
|
|
nUBucketPos = (nUBucketPos + insecure_rand.rand32()) % ADDRMAN_BUCKET_SIZE;
|
|
}
|
|
int nId = vvNew[nUBucket][nUBucketPos];
|
|
assert(mapInfo.count(nId) == 1);
|
|
CAddrInfo& info = mapInfo[nId];
|
|
if (RandomInt(1 << 30) < fChanceFactor * info.GetChance() * (1 << 30))
|
|
return info;
|
|
fChanceFactor *= 1.2;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_ADDRMAN
|
|
int CAddrMan::Check_()
|
|
{
|
|
std::set<int> setTried;
|
|
std::map<int, int> mapNew;
|
|
|
|
if (vRandom.size() != nTried + nNew)
|
|
return -7;
|
|
|
|
for (std::map<int, CAddrInfo>::iterator it = mapInfo.begin(); it != mapInfo.end(); it++) {
|
|
int n = (*it).first;
|
|
CAddrInfo& info = (*it).second;
|
|
if (info.fInTried) {
|
|
if (!info.nLastSuccess)
|
|
return -1;
|
|
if (info.nRefCount)
|
|
return -2;
|
|
setTried.insert(n);
|
|
} else {
|
|
if (info.nRefCount < 0 || info.nRefCount > ADDRMAN_NEW_BUCKETS_PER_ADDRESS)
|
|
return -3;
|
|
if (!info.nRefCount)
|
|
return -4;
|
|
mapNew[n] = info.nRefCount;
|
|
}
|
|
if (mapAddr[info] != n)
|
|
return -5;
|
|
if (info.nRandomPos < 0 || info.nRandomPos >= vRandom.size() || vRandom[info.nRandomPos] != n)
|
|
return -14;
|
|
if (info.nLastTry < 0)
|
|
return -6;
|
|
if (info.nLastSuccess < 0)
|
|
return -8;
|
|
}
|
|
|
|
if (setTried.size() != nTried)
|
|
return -9;
|
|
if (mapNew.size() != nNew)
|
|
return -10;
|
|
|
|
for (int n = 0; n < ADDRMAN_TRIED_BUCKET_COUNT; n++) {
|
|
for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
|
|
if (vvTried[n][i] != -1) {
|
|
if (!setTried.count(vvTried[n][i]))
|
|
return -11;
|
|
if (mapInfo[vvTried[n][i]].GetTriedBucket(nKey) != n)
|
|
return -17;
|
|
if (mapInfo[vvTried[n][i]].GetBucketPosition(nKey, false, n) != i)
|
|
return -18;
|
|
setTried.erase(vvTried[n][i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
|
|
for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
|
|
if (vvNew[n][i] != -1) {
|
|
if (!mapNew.count(vvNew[n][i]))
|
|
return -12;
|
|
if (mapInfo[vvNew[n][i]].GetBucketPosition(nKey, true, n) != i)
|
|
return -19;
|
|
if (--mapNew[vvNew[n][i]] == 0)
|
|
mapNew.erase(vvNew[n][i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (setTried.size())
|
|
return -13;
|
|
if (mapNew.size())
|
|
return -15;
|
|
if (nKey.IsNull())
|
|
return -16;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
void CAddrMan::GetAddr_(std::vector<CAddress>& vAddr)
|
|
{
|
|
unsigned int nNodes = ADDRMAN_GETADDR_MAX_PCT * vRandom.size() / 100;
|
|
if (nNodes > ADDRMAN_GETADDR_MAX)
|
|
nNodes = ADDRMAN_GETADDR_MAX;
|
|
|
|
// gather a list of random nodes, skipping those of low quality
|
|
for (unsigned int n = 0; n < vRandom.size(); n++) {
|
|
if (vAddr.size() >= nNodes)
|
|
break;
|
|
|
|
int nRndPos = RandomInt(vRandom.size() - n) + n;
|
|
SwapRandom(n, nRndPos);
|
|
assert(mapInfo.count(vRandom[n]) == 1);
|
|
|
|
const CAddrInfo& ai = mapInfo[vRandom[n]];
|
|
if (!ai.IsTerrible())
|
|
vAddr.push_back(ai);
|
|
}
|
|
}
|
|
|
|
void CAddrMan::Connected_(const CService& addr, int64_t nTime)
|
|
{
|
|
CAddrInfo* pinfo = Find(addr);
|
|
|
|
// if not found, bail out
|
|
if (!pinfo)
|
|
return;
|
|
|
|
CAddrInfo& info = *pinfo;
|
|
|
|
// check whether we are talking about the exact same CService (including same port)
|
|
if (info != addr)
|
|
return;
|
|
|
|
// update info
|
|
int64_t nUpdateInterval = 20 * 60;
|
|
if (nTime - info.nTime > nUpdateInterval)
|
|
info.nTime = nTime;
|
|
}
|
|
|
|
void CAddrMan::SetServices_(const CService& addr, ServiceFlags nServices)
|
|
{
|
|
CAddrInfo* pinfo = Find(addr);
|
|
|
|
// if not found, bail out
|
|
if (!pinfo)
|
|
return;
|
|
|
|
CAddrInfo& info = *pinfo;
|
|
|
|
// check whether we are talking about the exact same CService (including same port)
|
|
if (info != addr)
|
|
return;
|
|
|
|
// update info
|
|
info.nServices = nServices;
|
|
}
|
|
|
|
int CAddrMan::RandomInt(int nMax){
|
|
return GetRandInt(nMax);
|
|
} |